@megaJekan as said in your other thread, 480p is unnecessary for a pi3b+ and pcsx. psx emulation has been running full speed on pis since the pi2. if you're getting slowdown at 1080p and NO shaders, you have a system issue. as for curvature shaders - zfast should be full speed at 1080p on most games and is the fastest one available. they won't look at 480p as it's just not enough resolution for that effect to look good. it's not enough resolution for a non-curved scanline shader...